The Role of Relayer

CC-BY ijclark@Flickr

Undoubted Witness
 

Before we start

You just need to know followings to complete the workshop

1. a little Linux command
2. a little docker command

You are still welcome to take a look at this work shop

if you are not ready to hack

Before next slide

1. Install docker, https://www.docker.com/

2. Download the docker image if already installed

   docker pull yanganto/darwinia-workshop
3. Open the hands on notes in other tab
   darwinia-network/workshop@github

When you are waiting others, you may read pervious talk

Internet of Tokens, Connected!

Base On Substrate, Here is our Github

Verify

is

Witness + Check

How can a relayer be undoubted witness?

Relayer Architecture

As flexible as possible

Relay as you want

• Offchain worker

  • with Darwinia shadow service
  • with local shadow service
• Local worker
  • DJ: darwinia.js

Darwinia Shadow Service

Offchain

Worker

Protocol

shadow.darwinia.network

Source

Protocol

{
  "id":1,
  "jsonrpc":"2.0",
  "result": {
    "eth_header":  "0xd4e5 ...scale_encoded_str",
    "proof": "0xd4e5...scale_encoded_str"}
}

{
  id: 1,
  jsonrpc: "2.0",
  method: "shadow_getEthHeaderWithProofByNumber",
  params: {"block_num": 1000, "transaction": false}
}

Request:

Response:

Reference

Offchain worker

• Source

• FetchInterval = 3

• fn offchain_worker

• has key & can signed

Local Shadow Service

Offchain

Worker

http://shadow.darwinia.network

Dargo: Darwinia.go

Local Shadow Service

• Setup hosts

• Proxy by ports
• setting

Relayer incentive model

• System Treasure Support
• Redeem fee
  • success relay will in a pool
  • paid according the ratio
• https://github.com/darwinia-network/darwinia-common/pull/108

1. Open the hands on notes in other tab
2. Let's know how to build things
3. Let's try to be a relayer

Lets Hand On

Q & A

Thank You

See you in Darwinia Network !